diff --git a/ApplicationLibCode/FileInterface/RifFaultRAJsonWriter.cpp b/ApplicationLibCode/FileInterface/RifFaultRAJsonWriter.cpp
index 355739ef34..23630bcf28 100644
--- a/ApplicationLibCode/FileInterface/RifFaultRAJsonWriter.cpp
+++ b/ApplicationLibCode/FileInterface/RifFaultRAJsonWriter.cpp
@@ -36,7 +36,7 @@ bool RifFaultRAJSonWriter::writeToPreprocFile( RimFaultRAPreprocSettings& settin
     outErrorText = "Unable to write to file \"" + filename + "\" - ";
 
     QFile file( filename );
-    if ( file.open( QIODevice::ReadWrite ) )
+    if ( file.open( QIODevice::ReadWrite | QIODevice::Truncate | QIODevice::Text ) )
     {
         QTextStream stream( &file );
 
@@ -69,7 +69,7 @@ bool RifFaultRAJSonWriter::writeToPostprocFile( int faultID, RimFaultRAPostprocS
     outErrorText = "Unable to write to file \"" + filename + "\" - ";
 
     QFile file( filename );
-    if ( file.open( QIODevice::ReadWrite ) )
+    if ( file.open( QIODevice::ReadWrite | QIODevice::Truncate | QIODevice::Text ) )
     {
         QTextStream stream( &file );
 
diff --git a/ApplicationLibCode/ProjectDataModel/Faults/RimFaultRASettings.cpp b/ApplicationLibCode/ProjectDataModel/Faults/RimFaultRASettings.cpp
index da4adbf5b7..c43cae66d1 100644
--- a/ApplicationLibCode/ProjectDataModel/Faults/RimFaultRASettings.cpp
+++ b/ApplicationLibCode/ProjectDataModel/Faults/RimFaultRASettings.cpp
@@ -415,7 +415,8 @@ std::list<RimGenericParameter*> RimFaultRASettings::basicParameters( int faultID
 //--------------------------------------------------------------------------------------------------
 std::list<RimGenericParameter*> RimFaultRASettings::advancedParameters( int faultID )
 {
-    m_advancedParametersRI->setParameterValue( "eclipse_loadstep_start", loadStepStart() );
+    bool advanced = true;
+    m_advancedParametersRI->setParameterValue( "eclipse_loadstep_start", loadStepStart( advanced ) );
     m_advancedParametersRI->setParameterValue( "eclipse_loadstep_end", loadStepEnd() );
     m_advancedParametersRI->setParameterValue( "faultid_calibration", faultID );
     m_advancedParametersRI->setParameterValue( "abaqus_elastic_properties", elasticPropertiesFilename() );
@@ -505,9 +506,25 @@ QString RimFaultRASettings::advancedMacrisDatabase() const
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
-QString RimFaultRASettings::loadStepStart() const
+int RimFaultRASettings::timeStepDigits() const
 {
-    QString retval = QString( "PRESSURE_%1" ).arg( startTimeStepEclipseIndex(), 2, 10, QChar( '0' ) );
+    if ( m_eclipseCase == nullptr ) return 1;
+
+    int timesteps = m_eclipseCase->timeStepStrings().size();
+    if ( timesteps <= 0 ) return 1;
+
+    return 1 + (int)( std::log10( 1.0 * timesteps ) );
+}
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+QString RimFaultRASettings::loadStepStart( bool advanced /* = false */ ) const
+{
+    int startStep = 0;
+    if ( !advanced ) startStep = startTimeStepEclipseIndex();
+
+    QString retval = QString( "PRESSURE_%1" ).arg( startStep, timeStepDigits(), 10, QChar( '0' ) );
     return retval;
 }
 
@@ -516,7 +533,7 @@ QString RimFaultRASettings::loadStepStart() const
 //--------------------------------------------------------------------------------------------------
 QString RimFaultRASettings::loadStepEnd() const
 {
-    QString retval = QString( "PRESSURE_%1" ).arg( endTimeStepEclipseIndex(), 2, 10, QChar( '0' ) );
+    QString retval = QString( "PRESSURE_%1" ).arg( endTimeStepEclipseIndex(), timeStepDigits(), 10, QChar( '0' ) );
     return retval;
 }
 
diff --git a/ApplicationLibCode/ProjectDataModel/Faults/RimFaultRASettings.h b/ApplicationLibCode/ProjectDataModel/Faults/RimFaultRASettings.h
index e928b672db..bc5e683eba 100644
--- a/ApplicationLibCode/ProjectDataModel/Faults/RimFaultRASettings.h
+++ b/ApplicationLibCode/ProjectDataModel/Faults/RimFaultRASettings.h
@@ -64,7 +64,7 @@ public:
 
     int     startTimeStepEclipseIndex() const;
     QString startTimeStepEclipse() const;
-    QString loadStepStart() const;
+    QString loadStepStart( bool advanced = false ) const;
     int     endTimeStepEclipseIndex() const;
     QString endTimeStepEclipse() const;
     QString loadStepEnd() const;
@@ -95,6 +95,7 @@ protected:
 
 private:
     void setupResInsightParameters();
+    int  timeStepDigits() const;
 
 private:
     caf::PdmPtrField<RimEclipseInputCase*> m_eclipseFRAGeneratedCase;